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HELP Processor CPU Speed decreased?

Hello everyone, i own an inspiron 9300 with a 2.0 GHZ Centrino, 1gb ram 100gb hd. I recently noticed a decrease in my CPU speed, which i know is 2.0 GHZ, when i tried the CNET vista readiness advisor, it said i had only 733 mhz!! i thought it was a software mistake, but then i right clicked on My PC and found out that yes, it says, pentium M processor 2.0 Ghz, then right below it says 798 Mhz 1gb Ram. i found it weird but then i thought maybe i hadnt seen it before.. then i formatted my lap new partitions and stuff and then i saw processor speed was up again at 2.0 Ghz.both besides the cpu name and the Ram..
then a few hours ago i noticed my system to be a tad slower than usual and by curiosity i right clicked on my pc and the mhz are back to 798!!! what;s with that? i know my processor has Speedstep, but the laptop is plugged to the AC so i see no reason to do that. Does anyone know what's going on? is it a software i recently installed ?(messenger, autocad, photoshop and similars basically)

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Sounds normal for a Pentium M CPU

In reply to: HELP Processor CPU Speed decreased?

Google: Intel SpeedStep

Essentially, it extends your battery life between charges.

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In reply to: HELP Processor CPU Speed decreased?

weird, because just to prove i opened at the same time photoshop, autocad and illustrator and was repeatedly openin My PC properties, and CPU speed never went up over 798 mhz, it even went down to 450 for a while and then 500 and back to 798.
today it booted with 2.0ghz again... what determines speed?? is there any way i can say 'i need the power right now" despite what the 'intelligent' processor thinks?

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Dell support article

In reply to: weird

Short answer: Change the "Power Schemes" setting in the Power Options control panel to "Always On" (or "Home/Office Desk" if using A/C power)

All the details:
How does my Dell portable computer system utilize an Intel SpeedStep

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